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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The longest a person has survived after a heart transplant is 24 years.